Size dependence of the structure of organic aerosol

Daniel P. Veghte, Muhammad Bilal Altaf, Miriam Arak Freedman

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


The effects of aerosol particles on heterogeneous atmospheric chemistry and climate are determined in part by the internal arrangement of compounds within the particles. We have used cryo-transmission electron microscopy to investigate the phase separation behavior of model organic aerosol composed of ammonium sulfate internally mixed with succinic or pimelic acid. We have found that no particle with a diameter <170 nm for succinic acid and 270 nm for pimelic acid is phase separated. Larger particles adopt a phase separated, partially engulfed structure. We therefore demonstrate that phase separation of aerosol particles is dependent on particle size and discuss implications for aerosol-climate interactions.

Original languageEnglish (US)
Pages (from-to)16046-16049
Number of pages4
JournalJournal of the American Chemical Society
Issue number43
StatePublished - Oct 30 2013

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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